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Unformatted text preview: al Equipment in Hazardous Areas Hazardous area classification is based on the identification of areas or zones according to the likelihood of the presence of sensitive flammable gas or vapor concentrations. The most likely location for unguarded electrical equipment to ignite flammable gas is the area on or near the drill floor. Transocean classified the drill floor on the Deepwater Horizon as a Zone 2 hazardous area. Zone 2 denotes an area where explosive gas/air mixtures are not likely to occur, but if they do occur, they are expected to be present for only a short period of time. Electrical equipment in designated hazardous areas must be subject to the following safeguards: (1) explosion‐proof enclosures; (2) intrinsically‐safe equipment (does not have sufficient energy to ignite flammable gases); and (3) purged and pressurized equipment (contained within enclosures supplied with fresh air from a safe location at a pressure higher than the pressure of the surrounding area). The Panel found no evidence that electrical equipment in designated hazardous areas was an ignition source. MMS inspectors conducted three inspections while the Deepwater Horizon...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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